This perfectly captures my thoughts about the situation.
I don't know why they're so resistant to do treat SPAs as a completely valid way to use React in 2025. The majority of devs still use React primarily as a SPA. Recent State of React has it at 85% for SPA and 63% for SSR (1). Probably they know their answer is unpopular and thus we get a lot of deflection and phrases like "you should only consider a SPA if you have unusual constraints" whatever that's suppose to mean.
I've said it before, but changes don't happen when random devs like me complain, because I'm easy to ignore. So I really appreciate you specifically bringing this topic up, it really helps to get things going.